Liftr

Problem

Most workout tracking apps are locked behind paywalls and lack a social aspect. There exists strava for endurance activities, but there is no equivalent for strength training. Liftr was built as a lightweight, mobile-first app focused on fast logging, clear workout history, and user interactions in regards to workouts.

System Overview

Liftr is a cross-platform React Native app built with Expo. It uses Firebase Authentication to manage users and Firestore as a real-time backend to store workouts, exercises, and training sessions.

Core Features

• User authentication with persistent login
• Create and log workouts with multiple exercises
• Track sets, reps, and weights per exercise
• View historical workouts and training trends
• Follow other users to see their workouts
• Comment and like other users' workouts

Mobile Engineering

• Built with React Native + Expo for rapid cross-platform iteration
• Component-based UI with reusable form and list views
• Navigation stack for moving between workout, history, and profile screens
• Asynchronous Firestore queries for smooth, responsive UI

Backend & Data Model

• Firebase Authentication for secure user accounts
• Firestore collections for users, workouts, and exercise entries
• Real-time updates so new logs appear instantly
• Rules-based access control so users only see their own data